Fix and test for [perl #15549 Empty \Q\E not permitted]

[p5sagit/p5-mst-13.2.git] / t / comp / parser.t

#!./perl

# Checks if the parser behaves correctly in edge cases
# (including weird syntax errors)

BEGIN {
    chdir 't' if -d 't';
    @INC = '../lib';
}

require "./test.pl";
plan( tests => 12 );

eval '%@x=0;';
like( $@, qr/^Can't modify hash dereference in repeat \(x\)/, '%@x=0' );

# Bug 20010422.005
eval q{{s//${}/; //}};
like( $@, qr/syntax error/, 'syntax error, used to dump core' );

# Bug 20010528.007
eval q/"\x{"/;
like( $@, qr/^Missing right brace on \\x/,
    'syntax error in string, used to dump core' );

eval "a.b.c.d.e.f;sub";
like( $@, qr/^Illegal declaration of anonymous subroutine/,
    'found by Markov chain stress testing' );

# Bug 20010831.001
eval '($a, b) = (1, 2);';
like( $@, qr/^Can't modify constant item in list assignment/,
    'bareword in list assignment' );

eval 'tie FOO, "Foo";';
like( $@, qr/^Can't modify constant item in tie /,
    'tying a bareword causes a segfault in 5.6.1' );

eval 'undef foo';
like( $@, qr/^Can't modify constant item in undef operator /,
    'undefing constant causes a segfault in 5.6.1 [ID 20010906.019]' );

eval 'read($bla, FILE, 1);';
like( $@, qr/^Can't modify constant item in read /,
    'read($var, FILE, 1) segfaults on 5.6.1 [ID 20011025.054]' );

# This used to dump core (bug #17920)
eval q{ sub { sub { f1(f2();); my($a,$b,$c) } } };
like( $@, qr/error/, 'lexical block discarded by yacc' );

# bug #18573, used to corrupt memory
eval q{ "\c" };
like( $@, qr/^Missing control char name in \\c/, q("\c" string) );

# two tests for memory corruption problems in the said variables
# (used to dump core or produce strange results)

is( "\Q\Q\Q\Q\Q\Q\Q\Q\Q\Q\Q\Q\Qa", "a", "PL_lex_casestack" );

eval {
{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{
{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{
{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{
}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}
}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}
}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}
};
is( $@, '', 'PL_lex_brackstack' );